minitz.ino

#include <Adafruit_GPS.h>

#include "parsegps.h"
#include "tzmaths.h"
#include "timezones.h"
#include "tz_coords.h"

Adafruit_GPS GPS(&Serial2);

int get_timezone(long lat, long lon) {
  int tz;
  init_get_timezone(lat, lon);
  while ( (tz = continue_get_timezone(10)) == -1 )
    ;
  return tz;
}

void setup() {

  // let's get a serial connection
  while (!Serial)
  {
    Serial.begin(115200);
  }

  delay(100);
  // GPS for the adafruit ultimate GPS
  GPS.begin(9600);

}

void loop() {
  
  if (GPS.newNMEAreceived()) {
    if (!GPS.parse(GPS.lastNMEA()))   // this also sets the newNMEAreceived() flag to false
      return;  // we can fail to parse a sentence in which case we should just wait for another
  }

  // if millis() or timer wraps around, we'll just reset it
  if (GPS.fix) {
    long lat = GPS.lat;
    long lon = GPS.lon;

    int tz = get_timezone(lat, lon);
    // minitz has a very particular time/date format it wants
    int timetz = GPS.seconds + GPS.minute * 100 + GPS.hour * 10000;
    int date = (GPS.year-2000) + GPS.month * 100 + GPS.day * 10000;

    // get the time, pass it in as pointers
    int using_dst = apply_timezone(&timetz, &date, tz);

    // let's output the correct time!
    Serial.print(timetz / 10000);
    Serial.print(":");
    Serial.print((timetz / 100) % 100);
    Serial.print(":");
    Serial.print(timetz % 100);
    Serial.print(" ");
    Serial.print(using_dst ? "*" : "");
    Serial.print(" ");
    Serial.print(date / 10000);
    Serial.print("/");
    Serial.print((date / 100) % 100);
    Serial.print("/");
    Serial.println(date % 100);

  }

}